fix(azure): leave AZConfig and Deployment empty on a managed-instance page error

[cristim]

What

walkManagedInstances now reports whether the walk completed. On a page error, context cancellation or pager-construction failure, fetchServerInfo returns empty AZConfig and Deployment instead of deriving them from the partial sample.

Why

A failure on page two made page one's counts look like the whole subscription, stamping a confident "zoneRedundant"/"none" AZConfig (and a Deployment value) on recommendations.

Behaviour change

Pager-construction failure previously could still yield Deployment="single" when regular servers existed; it now leaves Deployment empty, matching the logged 'AZConfig/Deployment signal unavailable'. Conversion still does not fail.

Verified

• New test with page 1 ok, page 2 error: fails on pre-fix code (AZConfig=zoneRedundant, Deployment=managed), passes after.
• Table test with regular servers present (page 1 error, page 2 error after instances, context cancelled mid-walk): AZConfig and Deployment stay empty, so Deployment is not falsely "single". Mutation checks: disabling the complete guard or treating cancellation as complete makes these tests fail.
• No test for pager-construction failure: the pager is built from a real credential when none is injected, so there is no cheap injection point.
• Control: complete two-page walk still derives zoneRedundant/managed.
• go vet, go test ./... and golangci-lint run in providers/azure: clean.

Note: serverInfoOnce caches an empty result for the client's lifetime (client.go, cachedDominantAZConfig). This is pre-existing and tracked separately.

Closes #94

Summary by CodeRabbit

• Bug Fixes
  • Azure SQL recommendations are no longer derived from incomplete managed-instance listings. If listing fails or is canceled, configuration and deployment recommendations remain empty.
  • Recommendations continue to be generated when the full listing completes, including across multiple pages.

[cristim]

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📥 Commits

Reviewing files that changed from the base of the PR and between 6191fd2 and 751db4e.

📒 Files selected for processing (2)

• providers/azure/services/database/client.go
• providers/azure/services/database/client_test.go

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📝 Walkthrough

Walkthrough

The managed-instance pager walk now reports whether it completed. Conversion leaves AZConfig and Deployment empty when the walk is incomplete. Tests cover failed and complete multi-page walks.

Changes

Azure managed-instance signals

Layer / File(s)	Summary
Managed-instance walk and conversion providers/azure/services/database/client.go, providers/azure/services/database/client_test.go	The pager walk returns a completion flag. Conversion leaves AZConfig and Deployment empty if the walk does not complete. Tests cover pagination errors, cancellation, and a complete multi-page walk.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 751db

Incomplete managed-instance walks now leave AZConfig and Deployment empty instead of deriving them from partial counts. No merge-blocking risk was found in the supplied changes.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: leaving AZConfig and Deployment empty when managed-instance pagination fails.
Linked Issues check	✅ Passed	Issue #94 requires incomplete managed-instance walks to avoid deriving subscription-wide AZConfig from partial counts. walkManagedInstances now marks pager creation errors, page errors, and cancella…
Out of Scope Changes check	✅ Passed	The implementation and tests address issue #94. Leaving Deployment empty on incomplete walks prevents a partial sample from producing a misleading deployment signal and matches the unavailable-signal …
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 2 files.

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